Lowest FPE with reg AEA HP Carbine TD .22?

As long as it's the right thread and pitch.

BUT

There is no free lunch with semi-autos, it takes air to operate the blowback system. If you reduce that, you will not operate the blow back.
Why not just add a second LCD on the front of the shroud if you need it to be quiet?
It's not about noise, want the low power to be safer.
 
It can go lower but turning the TP power adjuster to lowest setting(if yours has one) but the semi auto mechanism will not cycle. If you don’t have a transfer power power adjustment version then you can adjust the power at all, A regulator don’t do much.

If you want backyard safe gun the semi auto AEA guns are not a fit. Try other bolt action 177 or 22 cal guns like Gamo urban or PROD.
 
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